add version highlight helper method, and call in doc#show
very frustrated at inability to convert js to ruby, highligth text
Only allow authors to delete versions
Merge branch 'master' of https://github.com/woolly-bear-caterpillars-2014/should-i-send-this into fix-document-version-delete
Merge pull request #59 from leeju/fix-document-version-delete

Fix document version delete